Why are there coloured blocks on my Samsung TV screen?

Last Update Date : Apr 23. 2018

If you are seeing coloured blocks in your picture the problem may be caused by a weak signal or an excessively strong signal. This issue is usually related to the received RF broadcast digital signal (or received satellite signal).

 

You can check the received signal strength and quality in the Support menu on the television. The ideal signal strength should be somewhere between 40%-80% and the signal quality should be reading zero errors or as near to zero as possible.


If the signal strength is low please check that your antenna has not moved or become damaged. If you are using an antenna amplifier make sure the connections, coaxial cable, and power cable are all in good condition.

To increase signal strength and hopefully reduce or completely remove such picture imperfections you can:

  • Attach an in-line amplifier
  • Use the Auto Tune function and re-tune if your problem is with over-the-air digital channels 
  • Use the Fine Tune function if your problem is with over-the-air analogue channels

If your signal strength is too strong then you will need to fit an inline signal attenuator. These come in various strengths in steps of 3dB, and can be used in any combination to achieve the desired signal strength. These can be purchased from any reputable antenna installer and from electronics retailers.

 

Note: if you have satellite TV you may be able to improve reception by adjusting your satellite dish. See the user's manual of your satellite dish or digital set-top-box for instructions, if possible, or contact your satellite TV provider for further details.

 

Attaching an in-line amplifier


You can try attaching an in-line signal amplifier (also called an RF amplifier or a signal booster) to the cable connecting your antenna, cable wall outlet or cable box to your TV. Amplifying the signal will often improve the picture. In-line amplifiers can be purchased from electronics retailers.

 

  

Using the Auto Tune function (for over-the-air digital reception)

 

 

Try auto-tuning your TV again. It may improve the signal and reduce or eliminate the picture problem(s). Follow these steps to do so:

 

If using the Smart Touch control:

 

1. Turn on your TV.

 

2. Press the MORE button.

 

3. Using the Touchpad - Slide Lefttouch pad to navigate on the virtual remote control on screen to highlight the MENU button icon and then press the centre of the touch pad.

 

4. Highlight Broadcasting and press the centre of the touch pad.

 

5. Highlight Auto Tuning on the list and then press the centre of the touch padPress the centre of the touch pad again.

 

6. Highlight Start and then press the centre of the touch pad.

 

7. When the auto tuning has finished press and hold the RETURN button to close all the menus.

 

If using the standard remote control:

  1. Turn on your TV.
  2. Press the MENU button on your standard remote control.
  3. Press the top Up or down Down navigation buttons on your remote control to select Broadcasting and then press the Menu ENTER button.
  4. Press the top Up or down Down navigation buttons on your remote to select Auto Tuning and then press the Menu ENTER button.
  5. Press the Menu ENTER button again.
  6. When the auto tuning has finished press the EXIT button to close the menus.

 

Using the Fine Tuning function (for over-the-air analogue reception)

Note: this section applies only to analogue signals, which are now fairly uncommon. Programs most likely to be broadcast over an anlogue signal are through satellite services to secondary or tertiary TVs in a house, such as through a Sky Digital subscription.

 

If using the Smart Touch control:

 

1. Turn on your TV.

 

2. Switch to the channel with poor picture quality.

 

3. Press the MORE button.

 

4. Use the Touchpad - Slide Lefttouch pad to navigate on the virtual remote control on screen and highlight the MENU button icon and then press the centre of the touch pad.

 

5. Highlight Broadcasting and press the centre of the touch pad.

 

6. Highlight Channel Settings and then press the centre of the touch pad.

 

7. Navigate using the track pad to highlight Fine Tune and then press the centre of the touch pad.

 

8. Slide your thumb left or right along the touch pad to adjust the fine tuning and find the setting that best restores the picture quality. If you want to reset the fine turning to zero, highlight Reset using your touch pad and then press the centre of the touch pad.

9. To store the fine tuning setting to your TV's memory press the centre of the touch pad.


10. Press and hold the RETURN button to close all the menus.

 

If using the standard remote control:

 

1. Turn on your TV.

 

2. Press the MENU button on your standard remote control.

 

3. Press the top Up or down Down navigation buttons to select Broadcasting and then press the Menu ENTER button.

4. Press the top Up or down Down navigation buttons to select Channel Settings and then press the Menu ENTER button

5. Press the top Up or down Down navigation buttons to select Fine Tune and then press the Menu ENTER button.

 

6. Use the Menu left and Menu right navigation buttons to adjust the fine tuning and find the setting that best restores the picture quality. If you want to reset the fine turning to zero, highlight Reset using the down Down navigation button and then press the Menu ENTER button.

  

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